Bite Forces with Mandibular Implant-retained Overdentures

Abstract

Sensitivity or pain of the mucoperiosteum covering the mandibular edentulous ridge is often thought to limit bite forces in complete-denture wearers. Therefore, bite forces with mandibular implant-retained overdentures may depend on the degree of implant support. This study analyzed the effects of different degrees of support for the mandibular denture on bite forces measured four years after denture treatment as part of a randomized controlled clinical trial. All subjects had received new maxillary dentures and (1) mainly implant-borne overdentures on a transmandibular implant (TMI), (2) mucosa-borne overdentures on two cylindric permucosal IMZ implants, or (3) new conventional dentures in the mandible. Fifty-three women and 15 men (mean age, 59.1 yrs; range, 41 to 77) participated in this trial. Both unilateral and bilateral bite forces were recorded at different positions with a miniature strain gauge transducer and a mechanical bite fork, respectively. The subjects were asked to bite at three force levels. Results indicated that women had significantly lower maximum bite forces than men. Persons with mandibular implant-retained overdentures had significantly higher unilateral and bilateral maximum bite forces than complete-denture wearers. However, bite forces did not differ between the mainly implant-borne (TMI) and mucosa-implant-borne (IMZ) implant systems. Therefore, it appears that differences in support for the mandibular overdenture by dental implants are not reflected in bite force capabilities.

The modular endoprosthesis for mandibular body replacement. Part 2: Finite element analysis of endoprosthesis reconstruction of the mandible

“…The stress distribution, areas of stress concentration, minimum and maximum principal stress and displacement at certain points were compared with that of an intact mandible as control, when loaded with a static load of 300 N at the incisor region. This simulates the bite force of an average patient (Van Eijden, 2000;Marunick et al, 1992;Curtis et al, 1999;Maurer et al, 2006;Fontijn-Tekamp et al, 1998). Variations were then made to the defect and stem sizes to look at any changes to the stress distribution.…”

The influence of bite force strength on brain activity: A functional magnetic resonance imaging study

“…However, our results demonstrate the feasibility of measuring the activated areas in the primary sensorimotor cortex during clenching using fMRI, which revealed that the brain activity is related to the magnitude of the bite force. Therefore, oral rehabilitation with prosthetic treatment, which increases the bite force, [17] not only improves the chewing efficacy but also affects the brain in a positive manner; potentially, the improved bite force may prevent brain degeneration. Additional studies comparing the brain activity before and after prosthetic treatment in edentulous subjects are recommended to evaluate the neurophysiologic effect of prosthetic treatment.…”

Periodontal Parameters in Different Dentofacial Vertical Patterns

“…25 A number of parameters have been used to categorize vertical facial type, including the cant of the mandibular plane, 26 cant of the palatal plane, 27 and ratios of anterior and posterior face heights. 26 In this study, maxillomandibular planes angle, facial height, and dental overbite were used to categorize the facial form.…”